linux-kernel - Re: [PATCH v3 02/06] devicetree: bindings: R-Car Gen2 CMT0 and CMT1 bindings

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Date:	Wed, 24 Feb 2016 13:19:25 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	Simon Horman <horms@...ge.net.au>
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Rob Herring <robh@...nel.org>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-renesas-soc@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3 02/06] devicetree: bindings: R-Car Gen2 CMT0 and CMT1 bindings

Hi Simon,

On Wed, Feb 17, 2016 at 9:08 PM, Simon Horman <horms@...ge.net.au> wrote:
> On Wed, Feb 17, 2016 at 03:45:19PM +0900, Magnus Damm wrote:
>> $ grep "renesas," Documentation/devicetree/bindings/dma/renesas,rcar-dmac.txt
>> - compatible: "renesas,dmac-<soctype>", "renesas,rcar-dmac" as fallback.
>>         - "renesas,dmac-r8a7790" (R-Car H2)
>>         - "renesas,dmac-r8a7791" (R-Car M2-W)
>>         - "renesas,dmac-r8a7792" (R-Car V2H)
>>         - "renesas,dmac-r8a7793" (R-Car M2-N)
>>         - "renesas,dmac-r8a7794" (R-Car E2)
>>         - "renesas,dmac-r8a7795" (R-Car H3)
>>         compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
>>         compatible = "renesas,dmac-r8a7790", "renesas,rcar-dmac";
>> $
>
> It looks like I have been making the mess worse :(
>
> Possibly I prepared the patch in question, though recently,
> before I was properly aware of the preferred order.

No worries! The code above is at least consistent and matches the
common current case.

>> No need to rework existing stuff IMO. However once we rework DT
>> bindings (CMT) or add new ones (SYS-DMAC) then we have a good
>> opportunity to clean things up.
>
> Understood. From my point of view that seems like an opportunity worth taking.

So shall we leave the SYS-DMAC as-is or change things around? I
personally don't see the point in redoing things just to change order,
so keep as-is sounds good to me.

For the "fallback" CMT DT compat strings I think we should follow the
proposal from Geert and go with "renesas,rcar-gen2-cmt0". Regarding
the per-soc CMT DT compat strings my feeling is that we should follow
the same order as SYS-DMAC to keep things consistent.

Thanks,

/ magnus